CASIO QW1634
Service Manual

3-2. CHECKING TERMINALS AND COMPONENTS : QW-1634 / 1635
6 .Capacitor / Chip C4 (7911 2485) 8 .Capacitor / Trimmer CT (7103 8124) 13 .Oscillator / Quartz Xtal (7110 1263)
VDD VDD VDD

C2 4 .Capacitor / Chip

(7103 4623)
C3 4 .Capacitor / Chip

(7103 4623)
LL1 9 .Coil

(7020 0511)
VDD

Tr 15 .Transistor / Mold
KI2 KI2

(7101 1151)

KI4 KI2 KI4 VSS1 VSS3

XT VDD VCH XTB XT L VCH VDD L L

N1 VDD N2 VDD

BD1 VSS2 AC

3 .PCB ass'y (7240 9925)

N3 VDD N4 VDD LD VSS2

VC VC

VCC KI1 ELD VDD ELD CIL CIL ELD KI8 KC2 KI1 VCPE VSS2 VCPE VDD LD RT1 RT2 RT2 RT1 ELD VSS2 CIL VSS2 VSS2 VSS2 VDD VDD KI3 KI3 CIL

KC4 KI3

KI5 KI1

VDD

C1 4 .Capacitor / Chip

(7103 4623)
Di 11 .Diode

(7101 5609) 5 .Capacitor / Chip C6 (7103 7940) 14 .Resistor / Chip R (7102 7737) 12 .Inverter INV (7100 7917)
LL2 10 .Coil

(7020 5931)
C5 7 .Capacitor / Tantalum

(7103 8094)

Top view of PCB ass'y

Bottom view of PCB ass'y

3-3. N1~N4 PADS
Never solder or desolder these pads, because they have been selected best in the production line. A new PCB ass'y as a spare parts will be supplied with factory adjustment of these pads.

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